v0.11.22 — Constitution amendments: amend-only-via-motion, sealed digest, verify fails closed on drift (CNCL-15)

council amend rewrites the constitution ONLY via a constitutional-class motion (2/3 + full quorum + founder veto): on a pass the new 5dive.md digest is hash-chained into the lineage and the file swapped (seal-first); a non-pass leaves it untouched; an invalid file is refused pre-convene. council verify + primary convene fail CLOSED on drift (verify RED, convene ESCALATE). council init seeds a v0 5dive.md and seals its digest into genesis. Pre-constitution lineages are explicitly legacy-green.